Tilting water-grate.



No. 70l,9 46. Patented June |0','|902.

- H. m: w. SAWYER. r .TILTING WATER GRATE.

(Application filed July 6, 1897. Renewed Nov. 12, 1901.)

(No Model.)

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UNITED STATES PATENT O F Eic E.

HOWARD DE W. SAWYER, or REVERE, MASSACHUSETTS.

T l LT IN G WATER-G RAT SPEGTFIGATION forming part of Letters Patent No.701,946, dated June 10, 196a.

- 'Applicationfiled July 6, 1897. Renewed November 12,1901. Serialrattan. uto man.)

To all whom/ 112? may concern:

certain newanduSefulI-mprovementsinTilt ing lVater- Grates, of which thefollowing,

taken in connection with the accompany'ing drawings, is aspecifications.

The object of-this invention is to for downward-draft stoves and otherforms of heating apparatus a tubular water-con taining tilting grate,through which andthe bearings therefor a current of water m aybeymainclinkers. By this improvementithe grater bars are preserved foryears against burning out, although exposed to the most intense heat,and the water circulating through them-- is raised to a high temperatureand still provision is inade for dumping whenever. re-.

quired.'-

Myin vention is embodied in a tubular grate:

provided with tubular trunnions and hollow bearings therefor,connected-with inlet and outlet pipes for water circulation under pressure through said parts. One form of such grate hasthe ends of itsparallel grate-bars connected to larger marginal or end tubes}. fromwhich, centrally and laterally, the hol low tapering trunnions projectthrough hollow balls forming bearings fixed on the ends of the inlet andoutlet pipes. through these balls'are tapered to fit the trunnions andtightening-nuts are provided at the closed outer ends, While a lateralaperture in each trunnion opens a waterway through the cavity inthe.ball, so that circulation is unimpedcd. i Lateralfyielding of the pipeson which the bearings. are fixed will compensate for'an'y elongation ofthe grate byv the heat.

In the drawings, Figure 1 is a plan of one of my improvedgrates and itsbearings; Fig.

2, a transverse section on line 2 2 of Fig. 1; Fig. 3, an enlargedsectionthrough the bearing-trunnion and adjacent portion of the grate.Figs.-4 and 5 show modified forms of grate.

A represents the parallel tubes forming hollow grate-bars, and B thelarger tubular ends of the grate, into which the tubes A open.

provide The openings.

one and the tubular bars A screwed into place.

by rightand left hand screws or' the parts otherwise united. It may insome cases facilitate insertion and removal of the grate if thetrunnions are made separate and screwed into a boss on the end tubes Bafter the body.

of the grateis in position in the stove.

. As shown'in Figs. 1 and 3, the bearings for the grate consist ofhollow balls or water-boxes D, mounted on the ends of the inlet-pipe Eand out-lebpipeF. These, pipes stand at right an-" gles to the axis ofthe grate and yield laterally with any variationsinlengthofthegratedueto the heat; The walls of the apert-u res through theseballs taper to correspond with the trun- 'nions toprovide a water-tightjoint. A lateral opening 0 throughthe tapering wall of.

the trunnion intoithe'concavity of the ball D gives a free passage forwater, thus insuring I a current through the grate at all times. The

end of the trunnion is closed, externally threaded, and provided With anut bearing against the ball," 'One'of the trunnions will be prolongedand squared to receive a crank, by which the grate may be tilted. (SeeFig. 3.) The grate may, hbwever, beformed of a sinuously-benttu'beTeither of a single continuouslengt-h or of successive short lengthsjoined by return-bends and with open frustoconical ends enteringtapering sockets, as indicatedin the modifications, Figs. 4 and 5.

I claim as my inventionprovi dedlwith hollow -trunnions formed with awater-passage through them, in combination with'hollow bearings for saidtrunnions inclosing and communicating with said water passages and. withinlet and outlet pipes at the oppositeends of said grate; terminating insaid bearings, and arranged at right'angles to the axis of the grate, soas to yield later ally, to provide for expansion an d contraction 1. Atilting,'tub ular,water-containing grate of the grate, and connected toa water-supply under pressure, whereby a water-current through the grateis maintained, substam tially as set forth.

2. Atilting,tubular,water-containinggrate consisting of a hollowgrate-body provided at its ends with central, projecting, taperingtrunnions having a lateral waterpassage through their tapering Walls, incombination with pressure inlet and outlet pipes at the opposite ends ofsaid grate, at right angles to its axis, to provide for expansion andcontraction of the grate, and with hollow bearings mounted on saidpipes, formed with tapering apertures to receive and fit upon saidtrunnions and inclose said water-passages, and with a nut on eachtrunnion adjacent to its bearing and adapted to tighten the joint,substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HOWARD DE XV. SAYVYER.

YVitnesses:

A. H. SPENCER, D. W. WoRMWooD.

